* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html,body {
    height: 100%;
    background-image: url(../pic/bak2.png);
    background-size: cover;
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-position:center  center;
}
.nav {
    width: 100%;
    height: 50px;
    border: 1px solid black;
    color: white;
    background-color: rgba(89, 98, 120,0.5);
    display: flex;
    justify-content:center;
    align-items: center;
}

.nav>img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    margin: 5px 10px;
}

.nav>.blog_title {
    width: 100px;
    text-align: center;
}
.nav>.space {
    width: 60%;
    height: auto;
    display: inline;
}

.nav>.nav_span {
    width: 100px;
    line-height: 50px;
    text-align: center;
    text-decoration: none;
    color: white;
}

.container {
    width: 80%;
    height: calc(100% - 50px);
    display: flex;
    justify-content: space-between;
    margin: 0 auto;
}

.container>.left {
    width: 20%;
    height: 100%;
}

.container>.right {
    width: 79%;
    height: 100%;
    background-color: rgba(255,255,255,0.6);
    padding: 20px;
    border-radius: 10px;
    overflow-y: auto;
}

.container>.left>.card {
    width: 100%;
    height: 300px;
    padding: 20px;
    border-radius: 10px;
    background-color: rgba(255, 255, 255, 0.614);
    text-align: center;
}

.container>.left>.card img {
    width: 100px;
    height: 100px;
    margin-bottom: 10px;
    border-radius: 50%;
}
.card h3 {
    margin-bottom:  10px ;
}
.card a {
    color: gray;
    text-decoration: none;
}
.card>.row {
    width: 100px;
    height: 30px;
    margin: 10px calc((100% - 100px)/2);
    display: flex;
    justify-content:space-between ;
}


.card>.row>span {
    width: 50px;
}